[da͡ɪˈamɪtə], [daɪˈamɪtə], [d_aɪ__ˈa_m_ɪ_t_ə]
Definitions of diameter

the length of a straight line passing through the center of a circle and connecting two points on the circumference

a straight line connecting the center of a circle with two points on its perimeter ( or the center of a sphere with two points on its surface)

Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve.

A diametral plane.

The length of a straight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock.

The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module.

A straight line through the center of a figure, dividing it in half; as, the diameter of the earth is 7, 926 miles.

The measure through or across: a straight line passing through the centre of a circle or other figure, terminated at both ends by the circumference.

Straight line passing through the centre of a circle and terminated at both ends by the circumference; distance through the centre.

A line through the center, as of a circle or sphere, terminated at the boundary thereof; the length of such a line.

A straight line passing through the centre of a circle from circumference to circumference, and dividing it into two equal parts; the length of a right line passing through the centre of an object, from one side to the other.

The measure of a body through from side to side; a straight line passing through the centre of a circle, having both ends terminated by the circumference.
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Usage examples for diameter

Each of the gyros was four feet in diameter and weighed five hundred pounds. – Space Platform by Murray Leinster

The ball is about three inches in diameter, bound with thick leather. – A Collection of College Words and Customs by Benjamin Homer Hall

The other two were fully thirty feet in length and about the same diameter. – Giants on the Earth by Sterner St. Paul Meek

Another form is that of thick walled pipes, 2 to 3 inches in diameter, a foot or more long, and with a bore of one half inch. – Peat and its Uses as Fertilizer and Fuel by Samuel William Johnson

The ground set apart for such use was generally oval; and towards one extremity of the long diameter, as it were in the focus, were these mounds and towers erected. – A New System; or, an Analysis of Antient Mythology. Volume II. (of VI.) by Jacob Bryant

If a lens be placed in the path of the reflected beam to form an image of the aperture, the colours which the film shows can be exhibited to an audience, if the diameter of the image be made four or five feet. – Colour Measurement and Mixture by W. de W. Abney

The diameter of the shaft was about fifty feet. – Captured by the Navajos by Charles A. Curtis

Before it was time to go to lunch, they had cleared half of a hollow sphere, six feet in diameter, out of the heart of the heap. – David Elginbrod by George MacDonald

You will notice that the blade can be adjusted to cut any diameter desired. – Advanced Toy Making for Schools by David M. Mitchell

They were from eight to ten feet in diameter, and about four and a half feet high, the opening into them not being larger than to allow a man to creep in. – Expedition into Central Australia by Charles Sturt

The tool may then be worked from one end to the other, getting a fairly smooth, regular surface, slightly above the diameter required. – A Course In Wood Turning by Archie S. Milton and Otto K. Wohlers

The diameter of its surface is about one hundred feet, with a slope extending to the adjoining bluff from which alone it is accessible. – The History of Peru by Henry S. Beebe

This tree must have been nearly three feet in diameter, and was about thirty feet high from the ground to the first branch; it was therefore impossible for the elephant to gather the coveted fruit. – Ismailia by Samuel W. Baker

Five of these spheres the petals were, I roughly calculated, about an inch and a half in diameter, the ball they enclosed larger by almost an inch. – The Metal Monster by A. Merritt

It is nearly round and has a diameter of about 6 inches. – The Nests and Eggs of Indian Birds, Volume 1 by Allan O. Hume

The upper length was six feet in diameter. – Northern California, Oregon, and the Sandwich Islands by Charles Nordhoff

Barbara county in 1833 measured a foot in diameter four foot above the ground. – The Earth as Modified by Human Action by George P. Marsh

In the yard of a private house on Carolina Street I saw an oleander nearly thirty feet in height, whose branches shaded an area twenty feet or more in diameter, and whose mammoth clusters of rosy flowers might have been counted by the hundred. – Campaigning in Cuba by George Kennan

The figures indicating the hours are four feet high and the minute marks ten inches in diameter. – Christopher and the Clockmakers by Sara Ware Bassett